Digital BW, The Print

Mr. Roark I totally respect your work and admire your dedication to making the perfect 
B&W print but, after reading this Discovery Channel-type thread on acidic prints and a 
previous post where you say you're working on ink formulations and stuff, I can't help but 
wonder if you wear a white lab robe all day with safety goggles and a slide ruler in your 
pocket.

It's alive it's alive!

LOL

I kid Mr. Roark  :)

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul Roark" <paul.roark@v...> 
wrote:
> Ernst,
> 
> Ammonia is very alkaline, with a pH of close to 12.  It is used in a number
> of de-acidification procedures.  See, for example, 
> 
> http://www.kb.nl/kb/resources/frameset_kb.html?/kb/cons/leather/chapter5.htm
> l
> 
> The problem they note there is that some dyes and pigments might be
> discolored.  Whether the images we deal with would be so affected needs to
> be tested.   
> 
> The reactions in the URL you cited seem to require UV light and pollutants
> in the air that causes a reaction that forms acidic NOx.
> 
> Again, however, I'm not a chemist.  In my experiments what I see is that
> acidic paper put in a bag with a cap half full of ammonia becomes alkaline
> very quickly, according to my acid test pen.
> 
> As to the fade testing of Ultima, the first sample was the wrong paper.
> I've just received the correct paper and will try to get a comparative fade
> test going early next week.  Then it'll be another month before it runs long
> enough to start seeing any significant results.
> 
> Paul
> www.PaulRoark.com 
> 
> ____________________________
> 
> -----Original Message-----
> From: Ernst Dinkla [mailto:E.Dinkla@c...] 
> Sent: Thursday, March 11, 2004 11:16 AM
> To: DigitalBlackandWhiteThePrint@yahoogroups.com
> Subject: Re: [Digital BW] Acidic Silver Prints? -- Update
> 
> Paul Roark wrote:
> 
> 
> > With inkjet prints there have been stories from Florida of very rapid
> > deterioration of Epson Enhanced Matte prints.  Presumably the heat and
> > humidity in Florida accelerates the acidic attack on the paper. 
> 
> > I think if I had an important print that was dry mounted on acidic board
> I'd
> > first de-acidify it in a bag with ammonia for about 20 minutes.  Then I'd
> > use the Wei To product on the back and hope that the dry-mount tissue
> > stopped the product from reaching the print. 
> 
> Remembering some ecological disputes about cow dung creating 
> ammoniac gases in the air and the resultant acids when ammoniac 
> gases are exposed to light I wonder whether that treatment will 
> no worsen the archival qualities. Could be just a local Dutch 
> problem of course :-) Similar thoughts are expressed here:
> 
> http://www.usask.ca/lists/alt-photo-process/1996/alt96b/0757.html
> 
> I think ammonia only reacts with UV light but I could be wrong.
> 
> I think buffering in the paper itself is the most important thing.
> 
> BTW, Paul any sign of fading on the Kodak Ultima paper yet ?
> 
> Ernst
> 
> 
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